Executive Summary
You walk into a newly renovated apartment.
It smells fresh.
The paint is dry.
The new cabinets look beautiful.
The flooring is spotless.
Many people describe this as the “new home smell.”
But what exactly are you smelling?
In many cases, the answer is a group of chemicals known as Volatile Organic Compounds, or VOCs.
VOCs are released from hundreds of everyday products, including paints, furniture, flooring, adhesives, cleaning products, air fresheners and even some cosmetics. Most are present at very low concentrations, and many dissipate over time. However, because modern homes are often tightly enclosed, these gases can accumulate indoors, especially after renovations or when ventilation is limited.
Understanding VOCs helps homeowners make informed decisions about ventilation, material selection and maintaining good indoor air quality.
Quick Facts
What are VOCs?
- VOC stands for Volatile Organic Compound.
- VOCs are gases, not dust or smoke.
- They are released from many everyday products.
- Some VOCs have noticeable odours; many have none.
- Every home contains VOCs to some extent.
- Good ventilation and careful material selection help reduce indoor VOC levels.
A Walk Into a New Apartment
Imagine visiting a friend who has just completed a major renovation.
Everything looks immaculate.
Fresh paint.
New wardrobes.
A stylish kitchen.
Comfortable sofas.
The room carries a distinctive smell.
Some people love it.
Others immediately open a window.
What you’re smelling isn’t “newness.”
You’re detecting tiny amounts of airborne chemicals released by new materials.
These chemicals belong to a large family known as Volatile Organic Compounds.
Although they are invisible, VOCs are one of the most common components of indoor air.
Science Minute
What Does “Volatile” Mean?
The word volatile doesn’t mean dangerous.
It simply means a substance evaporates easily at normal room temperature.
Imagine placing a small amount of perfume on your wrist.
Within seconds, people standing nearby can smell it.
Why?
Because some of the liquid has evaporated into the air.
That evaporation is what “volatile” means.
Many household products behave in a similar way.
Although they may appear completely dry, tiny amounts of certain chemicals continue entering the air over time.
What Exactly Are VOCs?
VOCs are carbon-containing chemicals that readily become gases at room temperature.
There are hundreds of different VOCs.
Some occur naturally.
Trees release natural VOCs.
Flowers release fragrant VOCs.
Even oranges release VOCs that give citrus fruits their characteristic smell.
Others are produced during manufacturing and are found in everyday consumer products.
This is why VOCs are not automatically “good” or “bad.”
The term describes how a chemical behaves, not whether it is harmful.
Where Do VOCs Come From?
One reason VOCs receive so much attention is that they come from so many different sources.
Many people are surprised to discover how many products release small amounts of VOCs.
Common indoor sources include:
Building Materials
- Paints
- Varnishes
- Adhesives
- Sealants
- Flooring
- Carpets
- Wallpaper
Furniture
- Engineered wood
- Plywood
- MDF furniture
- Cabinets
- Shelving
- Upholstery
Household Products
- Cleaning sprays
- Disinfectants
- Air fresheners
- Detergents
- Fabric softeners
- Scented candles
Personal Care Products
- Perfume
- Nail polish
- Hair spray
- Deodorants
- Cosmetics
Everyday Activities
Even ordinary daily activities can introduce VOCs into indoor air.
Examples include:
- Cooking
- DIY hobbies
- Painting
- Craft work
- Home repairs
In other words,
VOCs are a normal part of modern indoor environments.
The goal is not to eliminate every VOC—that would be unrealistic—but to understand their sources and manage indoor air wisely.
Why Are VOCs Usually Higher Indoors?
Imagine placing a drop of perfume in the middle of a football field.
Within minutes, the scent disappears into the open air.
Now imagine spraying that same perfume inside a small bedroom with the windows closed.
The fragrance lingers much longer.
This simple example illustrates why VOCs often reach higher concentrations indoors than outdoors.
Modern homes are designed to be:
- Comfortable
- Energy efficient
- Air-conditioned
These are all good things.
However, they also mean air exchanges with the outdoors occur less frequently.
If VOCs are continuously released from furniture, flooring or household products, they may accumulate unless removed through ventilation or air cleaning.
Not Every VOC Has a Smell
One of the biggest misconceptions is:
“If I can’t smell it, it isn’t there.”
Unfortunately, this isn’t always true.
Some VOCs have strong, distinctive odours.
Others are completely odourless.
Likewise, a strong smell doesn’t necessarily mean high risk.
Our noses are excellent at detecting certain chemicals but poor at detecting others.
This is why smell alone is not a reliable indicator of indoor air quality.
The “New Car Smell” and “New Home Smell”
Almost everyone recognises the scent of a brand-new car.
Many people enjoy it.
Others find it overwhelming.
What causes this distinctive smell?
In many cases, it comes from a mixture of VOCs released by new materials such as plastics, synthetic fabrics, leather treatments, adhesives and interior trim.
The same principle applies inside newly renovated homes.
Fresh paint, new flooring, cabinets, curtains and furniture each contribute small amounts of different VOCs. Individually, the amounts may be modest, but together they create the familiar “new home smell.”
Interestingly, as these materials age, the smell usually fades—not because the materials have changed colour or appearance, but because the rate at which they release VOCs gradually decreases.
This process is known as off-gassing.
Science Minute
What Is Off-Gassing?
Imagine opening a bottle of fizzy drink.
At first, bubbles escape rapidly.
After a while, the fizz slows down.
Many building materials behave in a similar way.
When they are new, VOCs are released more quickly. Over time, the release rate generally declines until only very small amounts remain.
Different materials behave differently, so some products stop off-gassing relatively quickly, while others continue releasing low levels for much longer.
Temperature and Humidity Matter
Singapore’s climate makes VOCs particularly interesting.
Warm temperatures increase the energy of molecules, making it easier for some VOCs to evaporate.
Higher humidity can also influence how certain materials release gases.
This means a cabinet in tropical Singapore may behave differently from the same cabinet in a cool, dry climate.
It’s one reason why indoor air quality recommendations should always consider the local environment rather than relying solely on overseas advice.
Are All VOCs the Same?
No.
The term VOC describes a very large family of chemicals.
Some have little noticeable odour.
Some are naturally produced by plants.
Some are used in perfumes and flavourings.
Others are associated with paints, fuels or industrial products.
Because VOCs vary so widely, it is misleading to think of them as a single substance.
A better analogy is this:
Saying “VOCs” is like saying “birds.”
A sparrow, an eagle and a penguin are all birds, but they are very different.
Likewise, hundreds of different chemicals are classified as VOCs, each with its own properties.
Why Is Formaldehyde Discussed Separately?
If formaldehyde is a VOC, why does it receive so much attention?
Because it is one of the most studied indoor air pollutants.
Formaldehyde has been researched extensively, is commonly associated with new furniture and renovation materials, and is specifically addressed in many indoor air quality guidelines around the world.
For this reason, it deserves its own chapter.
Think of this article as an introduction to the VOC family, while the next chapter focuses on one particularly important member of that family.
Can Plants Remove VOCs?
This is one of the most common questions homeowners ask.
The idea that houseplants can clean indoor air became popular after laboratory studies showed that certain plants could remove some VOCs under controlled conditions.
However, real homes are much more complex than laboratory chambers.
Air volume, ventilation, the number of plants and the rate at which VOCs are generated all influence the outcome.
Houseplants undoubtedly provide aesthetic and psychological benefits, but relying on a few potted plants alone is unlikely to be sufficient as a comprehensive indoor air quality strategy.
Myth vs Fact
Myth:
Only new homes contain VOCs.
Fact:
Every home contains some VOCs. New homes may have different sources and potentially higher emissions from new materials, but VOCs are also released from everyday products such as cleaners, fragrances and personal care items.
Myth:
A strong smell means a product is dangerous.
Fact:
Odour intensity and health risk are not the same thing. Some chemicals have strong smells at very low concentrations, while others have little or no odour.
Myth:
Once paint dries, it stops releasing VOCs.
Fact:
Drying and off-gassing are different processes. Some materials continue releasing small amounts of VOCs even after they feel completely dry.
Myth:
VOCs only come from synthetic materials.
Fact:
Many VOCs are naturally produced by plants, fruits and flowers. The term “VOC” describes volatility, not whether a substance is natural or synthetic.
Practical Ways to Reduce VOCs Indoors
Creating a healthier indoor environment doesn’t require eliminating every VOC. Instead, focus on reducing unnecessary sources and encouraging fresh air exchange when conditions are suitable.
Practical steps include:
- Choose low-emission paints, adhesives and furnishings where possible.
- Ventilate newly renovated spaces before moving in.
- Allow new furniture time to off-gas in a well-ventilated area.
- Store paints, solvents and chemicals according to manufacturer recommendations.
- Avoid excessive use of scented products if they are not needed.
- Follow product instructions when using cleaning agents.
- Maintain good airflow throughout the home.
Small improvements made consistently can make a meaningful difference over time.
VOCs Are Part of Everyday Life
One of the biggest misconceptions about VOCs is that they only exist in factories or newly renovated homes.
In reality, VOCs are part of modern life.
Every morning, many of us use shampoo, deodorant, perfume and hair products. We clean kitchen countertops, prepare breakfast, drive to work and return to homes filled with furniture, fabrics and electronics.
Each of these activities may introduce small amounts of VOCs into the indoor environment.
This doesn’t mean modern living is unsafe.
It simply means that good indoor air quality is about managing exposure, not fearing chemistry.
Many everyday substances—including oxygen and water—can be harmful under certain conditions. Likewise, not every VOC presents the same level of concern.
Understanding the source, concentration and duration of exposure is far more useful than reacting to the term “VOC” alone.
Looking at Indoor Air as a Complete System
Imagine walking into a room and asking,
“How healthy is the air in here?”
There isn’t a single instrument that can answer that question completely.
Why?
Because indoor air isn’t made up of just one thing.
A comprehensive assessment considers many different factors, including:
- Fine particles (PM2.5)
- VOCs
- Formaldehyde
- Carbon dioxide
- Humidity
- Temperature
- Ventilation
- Airflow
- Biological contaminants such as mould and allergens
Think of indoor air quality like a medical check-up.
A doctor doesn’t assess your health using only your heart rate.
They also consider blood pressure, temperature, weight, blood tests and medical history.
Indoor air quality works the same way.
VOCs are one important indicator—but they are only one piece of a much larger picture.
Frequently Asked Questions
Are VOCs always harmful?
No.
“VOC” is a broad category of chemicals. Some VOCs occur naturally in plants and fruits, while others are manufactured for industrial or household use. The potential impact depends on the specific compound, its concentration and the duration of exposure.
Why can I smell fresh paint?
Fresh paint contains ingredients that evaporate as the paint cures. Some of these evaporating substances are VOCs, which create the characteristic smell associated with newly painted rooms.
Why does the smell disappear after a few weeks?
As materials age, they generally release VOCs more slowly. This gradual reduction in emissions is why the “new paint” or “new furniture” smell fades over time.
Does opening the windows help?
In many situations, yes. When outdoor air quality is good, increasing ventilation helps dilute indoor VOC concentrations. However, during haze or periods of poor outdoor air quality, homeowners may need to balance ventilation with the introduction of outdoor pollutants.
Should I worry about every product that contains VOCs?
Not necessarily.
The presence of VOCs alone does not indicate that a product is unsafe. A better approach is to use products according to their instructions, choose lower-emission alternatives where practical, and maintain good ventilation.
Engineering Insight
One of the most interesting aspects of VOCs is that they behave very differently from particles.
Dust and PM2.5 are tiny solids or droplets suspended in the air.
VOCs are gases.
This distinction is important because the methods used to manage airborne particles are not always the same as those used to manage gases.
From an engineering perspective, improving indoor air quality means understanding the nature of the pollutant before deciding on the most appropriate solution.
Rather than asking,
“How do we remove pollution?”
Engineers first ask,
“What kind of pollution are we dealing with?”
That simple question often determines the most effective strategy.
Key Takeaways
- VOC stands for Volatile Organic Compound.
- VOCs are gases, not particles.
- Hundreds of different VOCs exist, originating from both natural and manufactured sources.
- Common indoor sources include paints, furniture, flooring, cleaning products, air fresheners and personal care products.
- New materials often release VOCs through a process known as off-gassing.
- Good ventilation, thoughtful material selection and sensible product use all contribute to managing indoor VOC levels.
- Formaldehyde is one type of VOC and is important enough to deserve its own chapter.
